▎ 摘　　要

NOVELTY - Preparing the potassium ion exchange membrane comprises (i) adding graphene and dispersant to the solvent to obtain graphene dispersion, (ii) mixing the liquid base polymer containing an amide structure in the side chain with valinomycin, and reacting at 25-50degreesC to obtain a graft polymer, (iii) adding the graft polymer obtained in the step (ii) to the graphene dispersion obtained in the step (i) to obtain a mixed dispersion of graphene-graft polymer, and (iv) casting the mixed dispersion into a membrane to obtain a potassium ion exchange membrane. USE - The method is useful for preparing potassium ion exchange membrane. ADVANTAGE - The method: ensures the stability of the ion exchange membrane during use; improves the service life, and film dielectric properties and stability.